The insulated fuel line on the small block looks nice and clean. However, the 440 has the distributor in that area, which makes routing more challenging. What kind of line insulation is it BTW?
ThermoTec.
https://www.summitracing.com/parts/the-18050?rrec=trueAeroquip, Earls, etc sell it too.
The one method that does work but is a PITA to implement is to run a return line to the tank with a restricted ID that will keep the unused fuel moving back to the tank while maintaining adequate pressure at WOT.
This is why the fuel injected vehicles don't have issues.